Crown block



w. c. TROUT Sept. 2 1924.

GROWN BLOCK Filed il 30. 1923 2 Sheets-Sheet 1 wcfmwc W. C. TROUT Sept.2 4- CROWN BLOCK 2 Sheets-Sheet 2 Filed April 30, 1923 :F'Out ZlmwtozPATENT) r or F I c 1:.

ALTER o. TROUT, or'ilUFKrN, TEXAS.

CROWN BLOCK.

Application filed April 30, 1923. Serial No. 635,629.

To all whom it may concern:

Be it known that I, WVALTER C. TROUT, a citizen of the United States,residing at Lufkin, Angelina County, Texas, haveinvented a certainnewand useful Improvement in Crown Blocks, of which .the following isaifull, clear, andexact descrip-' tion, such as will enable othersskilled in the art to which itappertains to make and use the same.-

In the operation of well drilling, the'load to behandled-on the derrickis often very great. Lengths-of drill-stem and casing. aggregatingthousands of feethave to be supported upon the cable running. over thecrown block of the derrick. In the lowering of the pipeinto the well,the cable sometimes runs at very high speeds, and it is'therefore'necessary that the crown block upon which the cable is supported mustbeconstructed to undergo exceptionally severe usage.

It is an object of my invention to provide a crown block whereon the.pulleys are mounted with comparatively large bearingsurfaces, wherebythe wear will'be reduced to a minimum.

be used upon bearings of the type described, which may be made ofexceptionally hard metal,; such as steel, and be strong and durable inoperation. Another object: is to provide a crown block and pulleysthereon which will be of few, and simple parts,. and; .so formed as toreadily supportthe weight which is suspended thereon. v

Further ob"ect scand advantages and the means whereby these objects areaccom-- plishedwill be set forthwith greater particula-rity in thedescription which follows: Referring to the drawing herewith, whereinlike numerals of. reference are applied to like parts in all the views,Fig. 1 is a top plan view of a. crown block embodying my invention,wherein two of the pulleys have been shown in central horizontalsection; Fig. .2 is an end elevation of the said crown block; and Fig. 3is a side elevation of one of the pulleys employed on the block.

It is customary in crown blocks employed in well drilling, to provide aplurality of 5 l p commodate ,thepulley. Another objectds toprovideapulley to pulleys supported upon a horizontal frame work in such mannerthat the cable em-. ployed in hoisting operationsmay be run over each ofthe pulleys in succession,,- or over any desired-numberofthe saidpulleys. In thedrawin'g I have illustrated five of such pulleys,although obviously, the .par-

ticular arrangement and number of the said pulleysmay be varied inanydesired manner.

My invention relates to crown .blocks, for. particular use on derrickssuch as are em-' ployed in the drilling and pumping of deep wells in theproduction of oil, gas,.sulphurand the like.

The framework constituting the body 0t my crown. block is made up of aseries of longitudinally supporting plates 1, which, as shown inFig, 2,may be of the ordinary. I-beam construct1on,.these beams beingconnected. at their ends by cross bolts 2 extending from side to side ofthe said supports Between the adjacent I-beams and supporting them apartat each end, 1 provide Y diameterrelative to that of the pulley, sothat-the pulley itself may be in the form of a r ng surrounding thebearing. Cenbearing rings or tracksare of comparatively'large trally ofthe track, and furnishing a support therefor, is a web, 5, which maybecut away on each quadrant as shown at 6, for the purpose of lightness.This web has a verticalrib'? on each side thereof, which is inclinedoutwardly from the upper end and forms a bracket connecting with a. baseplate 8 thereof, which islextended laterally on each side to provide asupport adapted to rest upon the supportingI-beams 1.- Theseplatesaresecured' firmly in position upon theIibeams by means of boltsvand nuts, '17. Below the supporting bracket thusformed, the web 5 isextended downwardly to connect with the lower portion of the ring,

It will be noted that the support for the -openings in a holding ring14:, to secure,

may run'. The flange 10 thus formed on one side of the bearing is madeintegral with the track itself. On the other side the flange 11 is maderemovable so that the pulley may be taken off or replaced, as desired.

The pulley ring 9 has an interior smooth bearing surface to run upon thetrack 4:, and between the said track and bearing surface I prefer toplace a series of non-friction bearings 12. These bearings are shownas'cylindrical rollers having a small trunnion 13at each end, wh'ch fitswithin spaced the bearings in spaced relation on the track. The outersurface of the pulley 13 formed with a central groove or channel 15, 1nwhlch a rope or cable may run.

' may be of hardened steel.

Provision is made for lubricating the bearing rollers by means of smalloil ducts 16 extend ng from'the inner. face of the track, outwardlytoward the bearings, as shownparticularly in Fig. 1. The opening ma beclosed under ordinar circumstances by means of a threaded plug, asdesired.

In the operation of this type of crown block, the block is assembled, asshown in the drawings, each of the supporting brackets and plates beingmounted securely upon the frame with the bearings and pulleys placed inproper posit'on thereon and secured in place by means of the plates 11on the side thereof. The pulley rings are thus adapted to rotate upon abearing of large diameter. It is possible to make the pulley of largerdiameter than is ordinarily the case, for the reason that the bearing isstron and light, and. the r'ngs themselves By making the rings largerand the bearings of large di ameter, the rotation upon the bearing isnot so rapid, and the wear upon the bearing surface is greatly reduced.The use of the roller bearings assist materially in decreaschanges inform and arrangement may be made without departing from the spirit of myinvention.

What I claim as new and desire to protect by Letters Patent is:

l. A crown block comprising a horizontally disposed frame, a series ofpulley bearings, on said frame, each bearing comprising an annularvertically arranged track,

radially extendingmarginal flanges 'on'said.

track forming a channel, a central vertically arranged supporting webfor said track, laterally eXt'endng plates forming brackets on said webadapted to rest on said frame to support said track, and pulley ringsrotatable in said channel on said track.

2. A crown block comprising a horizontally disposed frame, aseries ofpulley be arings on said frame, each :bearing comprising a verticallyarranged web, a channel-shaped track. thereon, an angular brackettosupport said web on said frame'and a pulley ring rotatable on each ofsaid bearings.

3. A crown block comprising a support, ing frame, a series of pulleybearings on said frame, each bearing comprising an annular track, asupporting web centrally of said track, brackets on said web supportedby said'frame, grooved rings rotatableron' said bearings, and non fricton means between said .rings and said bearings.

4. In acrown block, a pulley ring,a support therefor comprising anannular bearing, asupportmg web inside said bearing,

brackets formed on said web, a supporting frame for sald brackets andmeans to retain said pulley on sad bearings.

5. In a crown block, parallel supporting. beams, a vertical web havingan'annular bearing track thereon, laterally extending plates on said websupported on said beams, grooved pulley ring on said bearing track andmeans on said track to hold said ring iii-position thereon.

* 6. In a crown block a plurality ofparallel beams, a vertical webhaving horizontal plates integral therewith adapted .to reston saidbeams, a marginal rim on said web constituting a track, a pulley ringrotatable thereon and means on said track toretain said ring thereon.

In testimony whereof, I hereunto afiix my 25day of April, A. DJ

signature, this the 1923.

WALTER C. TROUT,

